JP4471095B2 - Branch power drawing structure - Google Patents

Description

  The present invention relates to a branch power drawing structure for branching from a superconducting cable to extract power. In particular, the present invention relates to a branch power extraction structure that extracts branch power from a connection portion of an AC superconducting cable.

  A multi-core batch type multi-phase superconducting cable in which a plurality of cable cores are integrated has been proposed (for example, Patent Document 1). FIG. 1 is a cross-sectional view of a three-core superconducting cable of a three-core type. The superconducting cable 100 has a configuration in which three cable cores 110 are twisted and housed in a heat insulating tube 120.

  The heat insulating tube 120 has a structure in which a heat insulating material (not shown) is disposed between the double tubes composed of the inner tube 121 and the outer tube 122, and the inside of the double tube is evacuated. Each cable core 110 includes a former 10, a conductor layer 20, an insulating layer 30, a shield layer 40, and a protective layer 50 in order from the center. The conductor layer 20 is formed by spirally winding a superconducting wire on the former 10 in multiple layers. The insulating layer 30 is configured by winding semi-synthetic insulating paper. The shield layer 40 is configured by spirally winding a superconducting wire similar to the conductor layer 20 on the insulating layer 30.

  On the other hand, peripheral devices such as various sensors, monitoring devices, auxiliary refrigerators, auxiliary pumps, and auxiliary vacuum pumps are used to operate such superconducting cables. These peripheral devices are usually arranged in a cave or a manhole, and a power source is required to drive them.

JP 2003-9330 (Fig. 5)

  However, in the conventional technology relating to the superconducting cable, an appropriate means for stably and easily providing the power supply for the peripheral device has not been established.

  As a power source for driving this peripheral device, it is conceivable to drive the peripheral device by supplying power from a system independent of the power of the superconducting cable. However, when the power from this independent power source is lost, a countermeasure is separately required to avoid a situation where power transmission is stopped by the superconducting cable and monitoring by peripheral devices is impossible.

  On the other hand, it is conceivable to drive peripheral devices using the transmission power of the superconducting cable. One means is to extract power from the superconducting cable using inductive coupling. However, in the case of a superconducting cable, a superconducting wire is used for the shield layer in order to eliminate the leakage magnetic field. In the shield layer 40, a current having substantially the same magnitude as that of the current flowing in the conductor layer 20 is induced in a normal state. The magnetic field generated by the induced current cancels out the magnetic field generated from the conductor layer 20, and the leakage magnetic field to the outside of the cable core 110 is made almost zero. Therefore, electric power cannot be taken out from the outside of the heat insulating tube 120 of the superconducting cable by inductive coupling.

  Accordingly, a main object of the present invention is to provide a branch power drawing structure capable of drawing branch power from a superconducting cable having a shield layer.

  The present invention achieves the above-mentioned object by extracting branch power by electromagnetic induction from a separation point where the magnetic field due to the current of the superconducting conductor layer and the magnetic field due to the current of the shield layer are not canceled at the connection portion of the superconducting cable.

  The branch power drawing structure of the present invention is a branch power drawing structure for drawing power from a connection portion of an AC superconducting cable having a superconducting conductor layer and a shield layer. In this connection structure, the superconducting conductor layer and the shield layer have a separation portion that is not coaxial in the connection portion. In addition, a refrigerant tank that immerses the separation portion in the refrigerant and a vacuum tank that covers the refrigerant tank are provided. And it has the inductive coupling means inductively coupled to the said isolation | separation location, and branching out electric power from a superconducting cable, It is characterized by the above-mentioned.

  Of the superconducting cable line, each layer that constitutes the superconducting cable is usually stripped at the connection part, so the part where the shield layer does not cover the outside of the superconducting conductor layer, that is, the superconducting conductor layer and the shield layer are non-coaxial. Separation points arranged in are formed. In this separation point, since the magnetic field due to the current of the superconducting conductor layer and the magnetic field due to the current of the shield layer do not cancel each other, the power is branched from the connection portion by inductive coupling using one of these magnetic fields. Can be taken out.

  The superconducting cable used in the drawer structure of the present invention typically has a structure in which a single-core or multi-core is housed in a heat insulating tube. The core has a former, a superconducting wire, an insulating layer, and a shield layer in order from the center. On the other hand, as the heat insulating tube, a heat insulating tube having a double tube structure having a vacuum layer between the inner tube and the outer tube is generally used.

  Further, the connection part of the superconducting cable used in the drawer structure of the present invention includes not only the intermediate connection part but also the terminal connection part.

  In the case of the intermediate connection portion, a typical configuration includes a connection portion for a three-phase collective superconducting cable. In this connecting portion, the three-phase cores are brought into contact with each other, and the shield layer in each core is partially peeled off to expose the insulating layer and the superconducting conductor layer. The superconducting conductor layers are connected to each other, and an insulating coating portion is formed around the connection portion. On the other hand, the shield layers are connected to each other between butted cores or cores of adjacent phases. The insulation coating portion and the shield connection portion are surrounded by a refrigerant tank and immersed in the refrigerant. Then, the periphery of the refrigerant tank is covered with a vacuum tank, and a vacuum is formed between the refrigerant tank and the vacuum tank to form an intermediate connection portion.

  In the case of the terminal connection part, typically, it has a terminal connection box in which the refrigerant tank is covered with a vacuum tank, the end of the superconducting cable along the horizontal direction is introduced into the refrigerant tank, and the vertical connection direction is One end of the draw bar is introduced into the refrigerant tank and the other end is drawn out of the vacuum tank, and one end of the draw bar and the end portion side of the superconducting cable are connected directly or indirectly in the refrigerant tank. As the lead bar, for example, a lead bar composed of a conductor part made of copper or aluminum and an insulating bushing made of FRP covering the outside of the conductor part can be used.

  Furthermore, in the case of the connection part of the superconducting cable which has a multiphase cable core, you may branch a refrigerant tank and a vacuum tank for every core. For example, in the case of a superconducting cable having a three-phase core, it can be considered that only the refrigerant tank is branched and the vacuum tank accommodates all phases at once. That is, a plurality of superconducting cables are accommodated in the connection portion. The refrigerant tank is provided with a refrigerant branch portion that branches for each superconducting cable and accommodates the separation portion, and the vacuum tank is configured to cover all the refrigerant branch portions collectively. And an inductive coupling means is formed in the separation part of a refrigerant branch part.

  In addition, in the case of a superconducting cable having a multi-phase core, a configuration in which both the refrigerant tank and the vacuum tank are branched may be considered. That is, a plurality of superconducting cables are accommodated in the connection portion. The refrigerant tank has a refrigerant branch portion that branches for each superconducting cable and accommodates the separation portion. A vacuum tank has a vacuum branch part which covers a refrigerant tank for every refrigerant | coolant branch part. And the inductive coupling means is formed at the separation location of the vacuum branching portion.

  On the other hand, in the case of a superconducting cable in which a plurality of single-core superconducting cables are arranged in parallel, the individual connection portions formed in each single-core cable are arranged in parallel, and branch power is drawn from the connection portion connecting the parallel individual connection portions. Is preferably performed. In other words, the connection portion includes an individual connection portion formed in each of the plurality of single-core superconducting cables and a short-circuit portion that short-circuits the shield layers of the respective superconducting cables between adjacent individual connection portions. The inductive coupling means provides this short-circuit portion as a separation location.

  In each of the connecting portions as described above, the inductive coupling means may be provided in at least one place in the refrigerant tank, outside the refrigerant tank, inside the vacuum tank, and outside the vacuum tank. Usually, the portion where the shield layer is peeled off from the core of the superconducting cable has an insulating layer and a large diameter. Therefore, it is preferable to provide inductive coupling means at a portion consisting only of the shield layer separated from the core.

  A specific example of the inductive coupling means includes a ring-shaped iron core and a coil body made of a conductive wire wound around the iron core. What is necessary is just to arrange | position this ring-shaped iron core in the outer periphery of a separation location.

  As a specific example of the separation location where the inductive coupling means is provided, the following location may be used in the connection portion.

(1) Locations of the core that are not covered by the shield layer
(2) In the case of having a multi-phase core, the shield short-circuit part in which the shield layers in the cores of the other phases are short-circuited in the vicinity of the connection portion of the superconducting conductor layer of each phase
(3) A shield connection location where a pair of cores are butted together and a superconducting conductor layer is connected, and the shield layers of both cores are connected in parallel to this connection location

  In the inductive coupling means, an induced current is generated by an alternating magnetic field flowing through the superconducting cable. The generated current is drawn to the outside of the connection portion through, for example, a lead wire. This lead wire passes through the refrigerant tank and the vacuum tank when the inductive coupling means is arranged in the refrigerant tank, and is vacuumed when the inductive coupling means is arranged outside the refrigerant tank and inside the vacuum tank. It is drawn out of the connection through the tank. In that case, it is preferable to seal the penetration part of the lead wire in the refrigerant tank or the vacuum tank with a hermetic seal or the like.

  The inductive coupling means is preferably connected with a peripheral device for a superconducting cable that is operated by the electric power extracted from the coupling means. For example, the lead wire is connected to the peripheral device of the superconducting cable, and the power from the inductive coupling means is used for the operation of the peripheral device. Peripheral devices include various sensors, monitoring devices, auxiliary refrigerators, auxiliary pumps, auxiliary vacuum pumps, and the like.

  According to the branching power drawing structure of the present invention, branching power can be drawn out by electromagnetic induction from a separation point where the magnetic field due to the current in the superconducting conductor layer and the magnetic field due to the current in the shield layer are not canceled at the connection portion of the superconducting cable. In particular, the superconducting cable has a lower voltage and a larger current than the conventional normal conducting cable, and thus is suitable for use in extracting branch power.

  Peripheral devices such as various sensors, monitoring devices, auxiliary refrigerators, auxiliary pumps and auxiliary vacuum pumps can be driven by the branch power drawn from the superconducting cable.

  Embodiments of the present invention will be described below.

(Superconducting cable)
First, prior to the description of the branched power drawing structure of the present invention, the configuration of a superconducting cable used in the structure will be described.

  FIG. 1 is a cross-sectional view of a three-core collective superconducting cable. This cable 100 has a configuration in which a three-core 110 is housed in a heat insulating tube 120. One-line cable is composed of three phases, and one core corresponds to each phase. Each core 110 includes a former 10, a superconducting conductor layer (conductor layer) 20, an insulating layer 30, a shield layer 40, and a protective layer 50 in order from the center. Of these layers, superconducting wires are used for the conductor layer 20 and the shield layer 40.

<Former>
The former 10 can be a solid one formed by twisting metal wires or a hollow one using a metal pipe. An example of a solid former is a twisted pair of copper strands. By using a former with a stranded wire structure, it is possible to simultaneously reduce AC loss and suppress temperature rise due to overcurrent. On the other hand, when a hollow former is used, the inside thereof can be used as a refrigerant flow path.

<Conductor layer>
The conductor layer 20 is preferably a tape wire in which a plurality of high-temperature oxide superconducting filaments are covered with a silver sheath. Here, Bi2223 tape wire was used. This tape wire is wound in multiple layers on the former to form the conductor layer 20. In this conductor layer 20, the twist pitch of the superconducting wire is different in each layer. In addition, the current flowing in each layer can be equalized by changing the winding direction for each layer or for each of the plurality of layers.

<Insulating layer>
An insulating layer 30 is formed on the outer periphery of the conductor layer 20. The insulating layer 30 may be formed by, for example, using a laminate of kraft paper and a resin film such as polypropylene (PPLP: registered trademark) manufactured by Sumitomo Electric Industries, Ltd. and wound around the outer periphery of the conductor layer 20. it can.

<Shield layer>
In an AC superconducting cable, a shield layer 40 for shielding magnetism is provided outside the insulating layer 30. The shield layer 40 is formed by winding a superconducting wire similar to that used for the conductor layer 20 around the insulating layer 30. The generation of a magnetic field to the outside can be canceled by inducing a current in the reverse direction to the shield layer 40 with approximately the same size as the conductor layer 20.

<Protective layer>
Further, a protective layer 50 is formed on the shield layer 40. This protective layer 50 mechanically protects the structure inside the shield layer 40, and is formed by wrapping kraft paper or cloth tape on the shield layer 40.

<Insulated pipe>
The heat insulating pipe 120 has a double pipe structure having a corrugated inner pipe 121 and a corrugated outer pipe 122. Usually, a space is formed between the corrugated inner tube 121 and the corrugated outer tube 122, and the space is evacuated. In the space to be evacuated, a super insulation (trade name) is arranged to reflect radiant heat. An anticorrosion layer 123 made of polyvinyl chloride or the like is formed on the corrugated outer tube.

Example 1
A structure for drawing branch power as a power source for peripheral devices from the intermediate connection portion of the superconducting cable will be described with reference to FIG. FIG. 2 is a schematic diagram showing a schematic configuration of the connecting portion. In this figure, only two cores are shown for convenience of explanation, but there are actually three cores. In FIG. 2, the thick solid line indicates the conductor layer of each core, and the broken line indicates the shield layer. In addition, there is a part where a thick solid line and a broken line are shown in parallel, but in this part, the shield layer is actually coaxially arranged outside the conductor layer via an insulating layer. The same applies to the connecting portions shown in each figure after FIG. 3 to be described later.

  This lead-out structure is provided in a connecting portion 200 where the ends of a pair of superconducting cables are butted and the three cores 110 constituting each cable are butted and connected.

  In order to configure the connecting portion 200, the end portions of the cores 110 are disposed so as to face each other, and are stripped so that the end portions of the conductor layer 20, the insulating layer, and the shield layer 40 are exposed. First, the conductor layers 20 of the cores 110 that are abutted together are connected to form a conductor connection portion. The insulating coating 31 is formed by wrapping an insulating paper around the conductor connecting portion.

  Further, the shield layers 40 of the cores of the respective phases are short-circuited at the end portions of the shield layer 40 by a short-circuit portion 41. That is, the short circuit portion 41 forms a closed circuit in which the shield layers 40 of the respective phases are connected to each other on the right side and the left side across the insulating coating portion 31. The short-circuit portion 41 is preferably connected to the shield layer 40 of each phase using a braided material having excellent flexibility.

  The end portions of each of the cores 110, the insulating coating portion 31, and the short-circuit portion 41 are accommodated in the refrigerant tank 210. In the refrigerant tank 210, a refrigerant such as liquid nitrogen is circulated to cool the superconducting wire used for the connecting portion to a cryogenic temperature. Further, the outside of the refrigerant tank 210 is insulated by the vacuum tank 220.

  In such a connection portion 200, there is a portion where the insulating layer is exposed and not covered by the shield layer 40 between the insulating covering portion 31 and the end portion of the shield layer 40. With these locations as separation locations, inductive coupling means 60 are provided on the outer periphery of the separation locations.

  As the inductive coupling means 60, a coil body in which a conducting wire is spirally wound around the outer periphery of a ring-shaped ferrite core was used. This coil body is arranged on the outer periphery of the separation part. In the figure, the ring-shaped coil body is shown as viewed from the outer peripheral side along the radial direction. In this example, the inductive coupling means is disposed in the refrigerant. Then, an induced current is generated in the conducting wire using a magnetic field generated by the current flowing through the conductor layer 20 at the separation location, and the induced current is drawn out through a lead wire (not shown). The lead wire passes through the refrigerant tank 210 and the vacuum tank 220 and is drawn to the outside of the connection portion, and each passing portion of the refrigerant tank 210 and the vacuum tank 220 is sealed with a hermetic seal.

  Then, the ends of the lead wires are connected to peripheral devices such as a monitoring device, an auxiliary refrigerator, and an auxiliary pump necessary for the operation of the superconducting cable, and these peripheral devices are driven using the branched power.

  Note that the short-circuit portion 41 itself of the shield layer 40 can also be used as another separation location. In this short-circuit portion 41, the shield layer 40 is separated from the conductor layer 20 of the superconducting wire and is arranged non-coaxially, so that the magnetic field due to the current flowing in both layers 20 and 40 does not cancel each other, and inductive coupling means The power can be drawn by 60.

  In addition, a pair of short-circuit portions 41 formed on both sides of the insulating coating portion 31 may be connected to each other, and inductive coupling means may be provided with the connecting member (not shown) as a separation point. Even in that case, the branch power can be similarly extracted.

(Example 2)
Next, a branch power drawing structure in an intermediate connection portion in which the shield layers of the other phases are not connected and the shield layers of the same phase are connected in parallel with the conductor layers will be described with reference to FIG.

  Also in this connection portion, the configuration of the superconducting cable, the conductor connection portion, and the insulation coating portion 31 are formed, and the connection portions of these cores 110 are collectively covered with the refrigerant tank 210 and the vacuum tank 220 as in Example 1. It is the same.

  The difference between the first embodiment and this example is not to short-circuit the shield layers 40 in the three-phase core 110 but to the shield coupling portion 42 in which the shield layers 40 in the in-phase core 110 connected to each other are connected. The inductive coupling means 60 is provided in the connecting portion 42. The configuration of the inductive coupling means 60 is the same as that of the first embodiment, and the point that the coupling means 60 is immersed in the refrigerant is the same as that of the first embodiment.

  Also in this example, since the connecting portion 42 is not provided with the shield layer 40 coaxially with the conductor layer 20, the electric power can be branched out by induction from the magnetic field of the current flowing through the connecting portion 42.

(Example 3)
Next, a structure for drawing branch power from a connecting portion having a refrigerant tank branched for each core and a vacuum tank that collectively covers the branched portions of these refrigerant tanks will be described with reference to FIG.

  In the first and second embodiments, the connecting portion of the superconducting cable is formed to be branched for each core 110. However, in this example, the difference is that the refrigerant tank 210 itself is also branched for each core 110. is doing. That is, the conductor connection portion and the insulating coating portion 31 are formed at the end portion of each core 110, and the shield layer 40 is short-circuited between the phases by the short-circuit portion 41. In addition, a separation point where the conductor layer 20 and the shield layer 40 are arranged non-coaxially is formed between the short-circuit portion 41 and the insulating coating portion 31.

  On the other hand, the refrigerant tank 210 is branched for each core to form a refrigerant branch part 211, and the insulation coating part 31 and the separation part are accommodated in each refrigerant branch part 211. In addition, the refrigerant branching portion 211 is configured to be divided into two right and left almost in the middle.

  The vacuum tank 220 is not branched, and a cylindrical container that collectively stores the refrigerant branching portion 211 of the refrigerant tank is used.

  In such a connection portion, the inductive coupling means 60 is provided on the outer periphery of the separation portion. The configuration of the inductive coupling means 60 is the same as that of the first embodiment. The inductive coupling means 60 may be provided at a separation location inside the refrigerant branch portion 211 or may be provided outside the refrigerant branch portion 211 and inside the vacuum chamber 220. In the latter case, the lead wire of the inductive coupling means 60 does not need to penetrate the refrigerant tank 210, and only needs to penetrate the vacuum tank 220. Even in such a branch power drawing structure, the branch power can be taken out from the connecting portion.

Example 4
Next, a description will be given of a structure for drawing branch power from a connecting portion that branches not only in the refrigerant tank but also in the vacuum tank for each core with reference to FIG.

  In the third embodiment, the refrigerant branch part 211 is formed in the refrigerant tank 210, and the vacuum tank 220 without the branch part is used. However, in this example, the vacuum tank 220 is also branched for each core 110. That is, the vacuum branch part 221 branched so as to individually cover the refrigerant branch part 211 of the refrigerant tank is formed in the vacuum tank 220. The vacuum branching part 221 has a structure that can be divided into two parts in the left and right substantially in the middle. Except for the point that the vacuum chamber 220 is also branched for each core 110, the configuration of the connection portion is the same as that of the third embodiment, and the separation point is arranged in each refrigerant branch portion 211.

  In this case, it is conceivable that the inductive coupling means 60 is provided outside the vacuum branch 221 as well as inside the vacuum branch 221 inside the refrigerant branch 211 or outside the refrigerant branch 211. And it can branch from a connection part similarly to Examples 1-3, and can take out electric power.

(Example 5)
Further, a structure for drawing branch power from the intermediate connection portion of the single-core superconducting cable will be described with reference to FIG. The single-core superconducting cable has a configuration in which the core of the three-core superconducting cable is a single core.

  Three such single-core superconducting cables 300 are juxtaposed, and each superconducting cable 300 has an individual connection portion 250 formed therein. Although only two hearts are shown in the figure for convenience of explanation, there are actually three hearts. These individual connection portions 250 are formed by forming a conductor connection portion of the superconducting cable 300 and providing an insulating coating portion 31 thereon. Each individual connection portion 250 is housed in the refrigerant tank 210 and immersed in the refrigerant, and further, the outside of the refrigerant tank 210 is covered with the vacuum tank 220 to be insulated.

  Here, a short-circuit portion 41 that short-circuits the shield layers 40 of the respective superconducting cables is formed between the adjacent individual connection portions 250. In this example, a closed circuit is formed in which the shield layers 40 of the individual connection portions 250 are connected to each other on the right side and the left side across the insulating coating portion 31. The short-circuit part 41 is covered with a refrigerant connecting part 212 and a vacuum connecting part 222 that connect the adjacent refrigerant tanks 210 and the adjacent vacuum tanks 220 to each other, and is immersed in the refrigerant.

  The inductive coupling means 60 is provided with the short-circuit portion 41 as a separation location. More specifically, inside the refrigerant tank 210 in the short-circuit portion 41, outside the refrigerant connection portion 212 in the short-circuit portion 41, inside the vacuum connection portion 222, outside the vacuum connection portion 222 in the short-circuit portion 41, other than the refrigerant connection portion 212 Inductive coupling means in the refrigerant tank 210 between the insulating coating 31 and the short circuit 41, outside the vacuum tank 220 other than the vacuum connection 222 and between the insulating coating 31 and the short circuit 41, etc. 60 should be provided. Even in this embodiment, power can be taken out from the connecting portion of the single-core superconducting cable 300.

  In FIG. 6, inductive coupling means are shown at a plurality of locations that can be used as separation locations, but any of these may be selected to provide inductive coupling means.

  The drawing structure for branching power of the present invention can be used in a superconducting cable line, and can use power extracted by branching to driving peripheral devices for operating the superconducting cable.

It is sectional drawing of the superconducting cable used for this invention structure. 1 is a schematic diagram of a structure of the present invention in Example 1. FIG. 3 is a schematic diagram of the structure of the present invention in Example 2. FIG. 3 is a schematic diagram of the structure of the present invention in Example 3. FIG. 6 is a schematic diagram of the structure of the present invention in Example 4. FIG. 6 is a schematic diagram of a structure of the present invention in Example 5. FIG.

Explanation of symbols

100 superconducting cable
110 core
10 Former 20 Superconducting conductor layer 30 Insulating layer 40 Shield layer 50 Protective layer
31 Insulation coating part 41 Short circuit part 42 Shield connection part 60 Inductive coupling means
120 heat insulation pipe
121 Corrugated pipe 122 Corrugated pipe 123 Corrosion protection layer
200 Connection part 210 Refrigerant tank 211 Refrigerant branch part 212 Refrigerant connection part
220 Vacuum chamber 221 Vacuum branch 222 Vacuum connection
250 Individual connection
300 single-core superconducting cable

Claims (7)

A branch power extraction structure for extracting power from a connection portion of a superconducting cable having a superconducting conductor layer and a shield layer,
In the connecting portion, the superconducting conductor layer and the shield layer are not coaxial, and the separation portion where the magnetic field due to the current in the superconducting conductor layer and the magnetic field due to the current in the shield layer are not offset , and
A refrigerant tank that immerses this separation in a refrigerant;
A vacuum tank covering the refrigerant tank;
An inductive coupling means that is provided inside the vacuum tank outside the refrigerant tank and generates an induced current using a magnetic field generated by a current flowing through a superconducting conductor layer or a shield layer at a separation point in the refrigerant tank ;
A lead wire for pulling out the induced current from the inductive coupling means to the outside of the vacuum chamber;
A branching power drawing structure characterized by comprising: A branch power extraction structure for extracting power from a connection portion of a superconducting cable having a superconducting conductor layer and a shield layer,
In the connecting portion, the superconducting conductor layer and the shield layer are not coaxial, and the separation portion where the magnetic field due to the current in the superconducting conductor layer and the magnetic field due to the current in the shield layer are not offset , and
A refrigerant tank that immerses this separation in a refrigerant;
A vacuum tank covering the refrigerant tank;
An inductive coupling means that is provided outside the vacuum chamber and generates an induced current using a magnetic field generated by a current flowing through the superconducting conductor layer or the shield layer at the separation point in the refrigerant bath ;
Have
A branching power drawing structure in which an induced current is drawn from the inductive coupling means . A plurality of cores constituting the superconducting cable are accommodated in the connection part,
The refrigerant tank has a refrigerant branching portion that branches into each core and stores a separation part,
The vacuum chamber is configured to collectively cover all the refrigerant branch parts,
The branching power drawing structure according to claim 1, wherein the inductive coupling means is provided in a refrigerant branching portion. A plurality of cores constituting the superconducting cable are accommodated in the connection part,
The refrigerant tank has a refrigerant branching portion that branches into each core and stores a separation part,
The vacuum chamber has a vacuum branch portion covering the refrigerant tank for each refrigerant branch portion,
The branching power drawing structure according to claim 1 , wherein the inductive coupling means is provided in a refrigerant branching portion. A plurality of cores constituting the superconducting cable are accommodated in the connection part,
  The refrigerant tank has a refrigerant branching portion that branches into each core and stores a separation part,
  The vacuum chamber has a vacuum branch portion covering the refrigerant tank for each refrigerant branch portion,
  The branch power drawing structure according to claim 2, wherein the inductive coupling means is provided in a vacuum branch section. The connecting portion is
An individual connection formed in each of a plurality of single-core superconducting cables;
Between adjacent individual connection parts, and having a short circuit part that short-circuits the shield layers of each superconducting cable,
The branching power drawing structure according to claim 1 , wherein the inductive coupling means is provided with the short-circuit portion as a separation portion.   The branch power drawing structure according to any one of claims 1 to 6, wherein the inductive coupling means is connected to a peripheral device for a superconducting cable operated by electric power extracted from the coupling means.

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